Operating instructions

22
Rotation guard
Description
The rotation guard checks that the machine is completely at a standstill before the door can
be opened. When the drum has been at a standstill for approx. two seconds the solenoid in
the door lock is deactivated and the lock can be opened (provided that the machine has been
emptied of water and the programmer has reset). The rotation guard also checks that the
drum is revolving when the wash or extraction relays are operating.
The rotation guard consists of a circuit board in the automatic control unit and a sensor in a
holder on the machine rear. There is a magnet on two of the spokes of the pulley. Each time
a magnet passes the sensor, a contact closes inside the sensor and it relays a pulse to the
rotation guard.
When the machine is at a standstill the rotation guard relays K1 and K2 are closed, which
means that the delay unit and the HI-TEK receive confirmation that the drum is not moving,
i.e. the rotation guard and the HI-TEK allow door opening.
Mechanical and electrical design
2436
34
2019
X91
X92
X93
X94
Fuse F1
X99
X90
X95
X96
LED
X90:1
X90:2
X91:1 X91:2
X92:2
X92:3
X72:7 X72:4
L1 N
X93:3
X95:2X95:1X93:2
X193:1
X193:2
Logic section
Pulses from B41: K1 and K2 change
immediately.
No pulses from B41: K1 and K2 operate after
approx. 2 sec.
This circuit is not used in HI-TEK
To control
circuits
Fig.
34